Grinding-machine attachment



Sept. '4, 1928. 1,683,354

- v. G. HONSTAIN ET AL -GRINDING MACHINE ATTACHMENT Filed Feb. 9,1 27 5Sheets-Sheet 1 \f. G: HOnS'tdLn.

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fitter/169st Sept. 4, 1928.

V. G. HONSTAIN ET AL GRINDING MACHINE ATTACHMENT Filed Feb. 9, 1927 5Sheets-Sheet 2 In. veniors: Vi (i Honsi'azn 5m t i'hson.

Sept. 4, 1928. 1,683,354

.V. G. HONSTAIN ET AL GRINDING MACHINE ATTACHMENT Filed Feb. 9, 1927 5Sheets-Sheet 4 '72 ,74 82 84 ;se 2). I I l III I \6 Ci Honst-cun.

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Patented Sept. 4-, 1928.

VERNON G. HONSTAIN AND ARTHUR SMITHSOII; OF- MINNEAPOLIS, MINNESOTA.

GRINDING-MACHINE ATTACHMENT.

Application filed. February 0111' invention relates to grinding ma chineattachments, and an object is to provide means by whiehthe output ofthema chine will be increased and the work of the operator will belightened. In the operation of grinding machines in use at the presenttime, the: article to begroundis forced by the hands of. the operatorinto engagement with the grinding wheel and is held by his hands in suchengagement during the grinding operation. In the course of the dayswork, this becomes very tiresome to the operator, and subjects him to agreat dealof strain not only on account of the force required to holdthe article against the grinding wheel but on account of the vibrationsimparted to his hands and arms. lVe overcome these disadvantages andlessen the time required for grind ing by the provision of mechanism inwhich other means than the hands of the operator is employed to forcethe article to be ground against the grinding wheel.

The full objects and advantages of our invention will appear inconnection with the detailed description thereof, and the novel featuresof our inventive idea will be particularly pointed out in the claims.

In the accompanying drawings whichillustrate several of the forms inwhich our invention may be embodied,

Fig. 1 is a side elevational view ofone form of the device. 2 is a frontelevational view thereof. Fig. '3 is a viewin horizontal sectionfonltheline 3-3 of Fig. 1. Fig. A is a side elevational view pf another form ofthe device. Fig. 5 is a fragmentary side elevational view showing aslight modification ofthe form shown in Fig. t. Fig. 6 is a fragmentaryside elevational view showing a further slight modification. Fig. 7 is aside elevational view of another form 'of the device. Fig. :8 isafragmentary side elevational view of another form. Fig. 9 is asectionalview of another-form. Fig. 10 is a side elevational view ofstill another form. Fig. 11 is a fragmentary sectional view of stillanother form. I Referring to the drawings the numeral 12. designates theframe. of a customary or suitable grinding machinehaving an emery wheelor similar grinding wheel 14 rotatably mounted thereon. Referring firstmore particularly to the form of inventionshown in Figs. 1, 2, and 3,the numerallfi desig- 9, 1927. Serial at. 166,999.

nat-es a plate secured to the floor by bolts 18 and having anoflsetforward portion 20 underneath. which extendsthe rearend of an adjustableplate 22 having a holethrough which passes a bolt 24, this belt being-adapt-' ed to pass alsothrough anyone of a series of holes 26 withwhiehthe raised portion of the plate 16 is provided. The plate 22 mayately pivoted upon a pivot member 36 which I passes through holes. atthe uper ends of i the standards 30. A foot pedal lever 38 is pivoted atits forward end on a pivot member 40 pasingthrough holes in the lowerpertions of the standards 30; A link 42 is attached atits lowerend tothe lever 38 by a pivot 14 and at its uper end is attached to theforward end of the gooseneck member 34: by a pivot 46. A coiled spring48at tached at its upper end to the .member 34 and at its lower end to oneofthe standards 30 normally holds the gooseneck 341 in downward positionasshown in full lines in Fig. 1. hen the pedal 38 is'depressed asindicated in dotted lines the main-portion of the gooseneck is swungupwardly and forwardly into the positionshown in dotted lines. The upperportion ofthe-gooseneck 34 is-bifurcated to receive the forward end of aholder 50 which is adjustably secured Y thereto by a bolt 52 having anutlike handle 54 The rear end of the holder 50 is provided with asocket for receiving the shank of a head member; 56 'whose rear end issuitably shaped to engage the forward end of an article such as acasting C whose rear end is to be ground. It is obvious that differentheads .56 may be substituted according to the shape. of the articlewhich isto be engagedand forced against the grinding 1 wheel. As shown,the casting has afin F produced during the casting operationand whichisbeing ground oifby the grinding wheel 14;. This casting is supportedon a rest 58 having a depending stem 60 which is wears down.

clamped in the split .end of a block '62 by a screw'bolt 64 passingthrough the split portions. The block 62 has a depending stem 66 whichis clamped by ,a screw bolt.6-8 :in the outer end of a projection 70extending out from the machine frame 12. It is evident that uponloosening the screw bolts 64 and 66, the rest 58 may be adjustedvertically and also toward and away from the grinding wheel14. Thelatteradjustment is of particular utility for adjusting the rest toward thegrinding wheel as the latter In the'form shown in Fig. 4 insteadofemploying the gooseneck member 34 previously described, a cylindrical1nember72 having a slot 74 is provided. This cylindrical member hasdownwardly-extending lugs 76 secured by a bolt 78 to the upper ends ofthe standards '30. A rod 80 passes slidably and axially through themember 72. The rod 80 has a socket in its rear end for receiving theshank of a head member '56 which as previously described may be changedaccording to the character and shape ofth'e work to be operated upon.The rod 80 is surrounded by a coiled spring 82 which is interposedbetween an end of the member 72 and a collar 84 secured to the rod sothat the spring normally holds the head '56 in retracted position. Aflexible member 86 which is-secured at its upper end to .a projection onthe rod 80 passes over a sheave 88 carried by the member 72 and thelower end of this flexible member is secured to an intermediate portionof the foot pedal 38. In the modification shown in Fig. 5, thecylindrical member 72 has a threaded stem "90 in place of the lug 76.The stem 90 extends through a plate -92 and is held in adjusted-positionby nuts 94 and 96. The plate 92 is secured to a projection 98 whichextends out from the frame of the grinding machine and resembles theprojection 70 previously referred to. ,A rest 100 has a stem 102.adjustably held by a screw bolt 164. In the further modification shownin Fig. 6. the cylindrical member 72 has a depending portion 106 whichis secured by bolts 108 and 110 to a plate 92 which is shorter than theplate 92 previously referred to. By removing the bolt 110, thecylindrical member 72 may be swungv down out of the way. In the formshown in Fig. 7, the standard is made in two parts 30 and 30 adjustablyheld together by a set screw 112 while theincl-ined braces are made intwo parts 42 and 42 having slots 114 and bolts 116 by means of which theparts may be adjusted. A bell crank 118 is pivotally attached at itselbow to the-upper-end portion ofthe standard by a pivot member 120. Theupperend of this bell crank has a slot 122 in which Works a pin 124secured to the rod 80. The lower end of the bell crank is pivotallyattached to a link .made in two parts 126 and 126 which have a slot 128and bolts 130 by means of which the two parts may be adjusted. To lowerend of this link is -:pivota'lly attached to the rear end of a pedalmember 38 intermediately pivoted -upon a bracket 132 extending up fromthe slidable plate 22. In the form shown in "Fig. 8, abell crank 134 ispivoted at its elbow upon a pivot member 136 carried by the upper end ofthe standard 30.

of the'link 140 is pivoted to a'pedal member similar to that alreadymentioned. A holder 144 is adjustably attached "to'the upper end of thesegment 138 "by abolt 146 having a nutlike handle 148. The holder 144 isprovided with a socket for holding the head member 56. In the form shownin Fig. '9,

the lugs 76 attachedto the upper end of a standard in the manner shownin Fig. 7 carry a cylinder 150 in which a rod 152 is 'slidably andaxially mounted. Theforward "end of the rod 152 carries a plunger 154which works in the cylinder. A coiled spring 156 surrounding the rod 152and interposed between the plunger 154and the rear head of the cylinderserves to normally retract the rod and attached plunger; The forward endof the cylinder is provided with a supply pipe 158 ;for the introductionof steam or compressed air whereby the employment of a foot pedal isdispensed with. In the form 7 shown in Fig. 10, a block 160 isadjustably secured to the upper end of the standard 30 by a bolt162'provided with a. nutlike handle 164. The'block 160 carries acylindrical member .166 in which av rod 168 'is slidably and axiallymounted. This rod at its rear end has a socket for receiving the shankof the head member 56. The lower side of the rod 168 is'provided' with arack 170 which is ex osed through a cut-out portion of the cyindricalmember. Meshing with this rack, there is a pinion 172 secured to a shaftv174 which is mounted in lugs 176 extending down from the cylindricalmember. An arm 178 secured to the shaft 174 is connected by a flexibleelement 180 with the foot pedal 38 which is pivoted to the lower portionof the standard 30. An adjustable stop 182 carried the standard servesto limit the upward movement of the foot pedal. A coiled spring 184secured at its outer end to the cylindrical member 166 and secured atits inner end to the shaft 174 normally holds the rod 168 in retractedposition. Theit'orm shown in Fig. 11 resembles that of Fig. 1 in that agooseneck member 34 similar to the gooseneck member 3 1 is employed andthis member is pivotally supported upon the upper end of the standards30 by a bolt 36. This bolt, however, instead of passing directly throughthe gooseneck member passes through a depend ing projection 186 withwhich a tubular member 188 is provided. The lower portion of thegooseneck extends slidably through the member 188 and on its under sideis provided with a series of teeth 190 which are adapted to be'engagedby a pair of teeth 192 carried by the upper end of a stem 194:. Thisstem passes through a recess in the projection 186, this recess being ofsuch size as to slidably receive the head of the stem which carries theteeth 194:. The stem is encircled by a coiled spring 196 placed in therecess and interposed between the bottom of the recess and the head ofthe stem. The lower end of the stem is provided with a knob 198 by meansof which the teeth 192 may be withdrawn from engagement with the teeth190 when it is desired to adjust the gooseneck longitudinally withrelation to the tubular member 188. The rear end of the latter member isprovided with a depending lug 200 to which a flexible connection 202 isattached, the lower end of this connection being attached to a footpedal as will be understood by reference to Fig. 1. A coiled spring 48normally holds the gooseneck in retracted position.

The operation and advantages of our invention will now be readilyunderstood. When it is desired to use the attachment for the grindingoperation, such as grinding off fins from castings formed during thecasting operation, the article is supported upon the rest in proximityto the grinding wheel. The movable member which may be of any of theforms shown is fitted with a head 56 of such shape as to firmly engagethe article without liability of slipping thereover and force is exertedupon the movable member for holding the article in engagement with thegrinding wheel until the desired amount of grinding is completed. Theoperator is relieved from strain on account of the manner in which themovable member is operated. Ac-

tual use of the attachment has demonstrated that the operator canaccomplish more work during the day and that he is not nearly as tiredat the end of the day as is the case when the articles are forcedagainst the grinding wheel by hand in the usual way.

We claim: 1. A grinding machine attachment comprising a work rest uponwhich. the article to be ground is adapted to be supported in proximityto the grinding wheel, a horizontal plate, means for adjustably securingsaid plate to the floor, a vertical support extending up from saidplate, a movable member carried by the upper end of said support andadapted to engage said article, and means "for exerting force upon saidmember for holding said article against the grinding wheel. I

2. A grinding machine attachment comprising a work rest upon which thearticle to be ground is adaptedto be supported in proximity to thegrinding wheel, a horizontal plate, means for adjustably securing saidplate to the floor, a vertical support extending up from said plate, amovable member carried by the upper end of said support and adapted toengage said article, resilient means normally holding said member inretracted position, and means for exerting force upon said member forholding said article against the grinding wheel.

3. A grinding machine attachment com prising a work rest upon which thearticle to be ground is adapted to be supported in proximity to thegrinding wheel, a horizontal plate, means for adj ustably securing saidplate to the floor, a vertical support extending up from said plate, agooseneck member pivoted to the upper end of said support, resilientmeans normally holding said member in retracted position, and means forexerting force upon said member for causing the upper end thereof toengage said article and hold it against the grinding wheel.

4;. A grinding machineattachment c0mprising a work holder upon which thearticle tobe ground is adapted to be supported in proximity to thegrinding wheel, a horizontal plate, means for adjustably securing saidplate to the floor, a vertical support extending up from said' plate, amovable member carried by the upper end of said support and adapted toengage said article, resilient means normally holding said member inretracted position, a foot pedal pivotally attached near the lower endof said vertical support, and connections between said foot pedal andmovable member for exerting VERNON e. HoNsTAIN. ARTHUR sMrrHsov.

